text: import decimal
  import json
  import os
  import unittest
  
  from httprunner import loader, utils
  from httprunner.utils import (
      ExtendJSONEncoder,
      override_config_variables,
  )
  
  
  class TestUtils(unittest.TestCase):
      def test_set_os_environ(self):
          self.assertNotIn("abc", os.environ)
          variables_mapping = {"abc": "123"}
          utils.set_os_environ(variables_mapping)
          self.assertIn("abc", os.environ)
          self.assertEqual(os.environ["abc"], "123")
  
      def test_validators(self):
          from httprunner.builtin import comparators
  
          functions_mapping = loader.load_module_functions(comparators)
  
          functions_mapping["equal"](None, None)
          functions_mapping["equal"](1, 1)
          functions_mapping["equal"]("abc", "abc")
          with self.assertRaises(AssertionError):
              functions_mapping["equal"]("123", 123)
  
          functions_mapping["less_than"](1, 2)
          functions_mapping["less_or_equals"](2, 2)
  
          functions_mapping["greater_than"](2, 1)
          functions_mapping["greater_or_equals"](2, 2)
  
          functions_mapping["not_equal"](123, "123")
  
          functions_mapping["length_equal"]("123", 3)
          with self.assertRaises(AssertionError):
              functions_mapping["length_equal"]("123", "3")
          with self.assertRaises(AssertionError):
              functions_mapping["length_equal"]("123", "abc")
          functions_mapping["length_greater_than"]("123", 2)
          functions_mapping["length_greater_or_equals"]("123", 3)
  
          functions_mapping["contains"]("123abc456", "3ab")
          functions_mapping["contains"](["1", "2"], "1")
          functions_mapping["contains"]({"a": 1, "b": 2}, "a")
          functions_mapping["contained_by"]("3ab", "123abc456")
  
          functions_mapping["regex_match"]("123abc456", "^123\w+456$")
          with self.assertRaises(AssertionError):
              functions_mapping["regex_match"]("123abc456", "^12b.*456$")
  
          functions_mapping["startswith"]("abc123", "ab")
          functions_mapping["startswith"]("123abc", 12)
          functions_mapping["startswith"](12345, 123)
  
          functions_mapping["endswith"]("abc123", 23)
          functions_mapping["endswith"]("123abc", "abc")
          functions_mapping["endswith"](12345, 45)
  
          functions_mapping["type_match"](580509390, int)
          functions_mapping["type_match"](580509390, "int")
          functions_mapping["type_match"]([], list)
          functions_mapping["type_match"]([], "list")
          functions_mapping["type_match"]([1], "list")
          functions_mapping["type_match"]({}, "dict")
          functions_mapping["type_match"]({"a": 1}, "dict")
          functions_mapping["type_match"](None, "None")
          functions_mapping["type_match"](None, "NoneType")
          functions_mapping["type_match"](None, None)
  
      def test_lower_dict_keys(self):
          request_dict = {
              "url": "http://127.0.0.1:5000",
              "METHOD": "POST",
              "Headers": {"Accept": "application/json", "User-Agent": "ios/9.3"},
          }
          new_request_dict = utils.lower_dict_keys(request_dict)
          self.assertIn("method", new_request_dict)
          self.assertIn("headers", new_request_dict)
          self.assertIn("Accept", new_request_dict["headers"])
          self.assertIn("User-Agent", new_request_dict["headers"])
  
          request_dict = "$default_request"
          new_request_dict = utils.lower_dict_keys(request_dict)
          self.assertEqual("$default_request", request_dict)
  
          request_dict = None
          new_request_dict = utils.lower_dict_keys(request_dict)
          self.assertEqual(None, request_dict)
  
      def test_print_info(self):
          info_mapping = {"a": 1, "t": (1, 2), "b": {"b1": 123}, "c": None, "d": [4, 5]}
          utils.print_info(info_mapping)
  
      def test_sort_dict_by_custom_order(self):
          self.assertEqual(
              list(
                  utils.sort_dict_by_custom_order(
                      {"C": 3, "D": 2, "A": 1, "B": 8}, ["A", "D"]
                  ).keys()
              ),
              ["A", "D", "C", "B"],
          )
  
      def test_safe_dump_json(self):
          class A(object):
              pass
  
          data = {"a": A(), "b": decimal.Decimal("1.45")}
  
          with self.assertRaises(TypeError):
              json.dumps(data)
  
          json.dumps(data, cls=ExtendJSONEncoder)
  
      def test_override_config_variables(self):
          step_variables = {"base_url": "$base_url", "foo1": "bar1"}
          config_variables = {"base_url": "https://httpbin.org", "foo1": "bar111"}
          self.assertEqual(
              override_config_variables(step_variables, config_variables),
              {"base_url": "https://httpbin.org", "foo1": "bar1"},
          )
  